[7] Nikola was part of the Buća noble family of Kotor, in the Serbian Kingdom (modern Montenegro).

[10] Nikola Buća along with Metropolitan of Prizren Arsenije, kaznac Baldovin, vojvoda Gradislav, župan Vratko, knez Grgur Kurjaković, stavilac Miloš (title mentioned for the first time), vojvoda Dejan Manjak, Gradislav Sušenica, and more, signed the letter issued by Stephen Uroš III, dated 22 January 1325, for the sale of some maritime possessions to the Republic of Ragusa.

[8] On 15 July 1326, King Stephen Uroš III confirmed that Andrija Peštić, Nikola Buća and Grubeta had paid their bills for some royal markets which they had leased.

[15] The most notable nobles of King Stephen Dušan (the velikaši, "great ones") received up to 1000 ducats, and Nikola Buća was given a plot of land in Ragusa itself, and a part of Ston.

[16] The city of Ragusa (modern Dubrovnik) had highly enriched itself during the rule of Emperor Stephen Dušan, who had constantly granted it gifts and delegations.

[15] There are sources saying that the Kotoran nobles received fame during the reign of King Stephen Uroš III, when they, under the command of Nikola Buća, captured the Bulgarian flag and cross during the Battle of Velbužd (1330).